/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package sun.nio.fs;

import java.lang.ref.Cleaner.Cleanable;
import jdk.internal.misc.Unsafe;
import jdk.internal.ref.CleanerFactory;

A light-weight buffer in native memory.
/** * A light-weight buffer in native memory. */
class NativeBuffer { private static final Unsafe unsafe = Unsafe.getUnsafe(); private final long address; private final int size; private final Cleanable cleanable; // optional "owner" to avoid copying // (only safe for use by thread-local caches) private Object owner; private static class Deallocator implements Runnable { private final long address; Deallocator(long address) { this.address = address; } public void run() { unsafe.freeMemory(address); } } NativeBuffer(int size) { this.address = unsafe.allocateMemory(size); this.size = size; this.cleanable = CleanerFactory.cleaner() .register(this, new Deallocator(address)); } void release() { NativeBuffers.releaseNativeBuffer(this); } long address() { return address; } int size() { return size; } void free() { cleanable.clean(); } // not synchronized; only safe for use by thread-local caches void setOwner(Object owner) { this.owner = owner; } // not synchronized; only safe for use by thread-local caches Object owner() { return owner; } }